Trying to work out what could be causing these strange rendering artifacts.
The screen shot here shows the same model rendered on the left with custom
OpenGL and on the right using Vtk 8.1. As you can see there are what look
like small pin holes in the polygon rendering on the Vtk view.
Any thoughts on what to try to remedy this issue appreciated. Thanks.
Interestly if i remove the vtkCleanPolyData (which i'm setting up with the
code below) i don't see the issue with the dots anymore, but the shading now
looks flat shaded so i lost the smooth shading effect.